Kids are the apple of my eye.

孩子是我的掌上明珠。

youdao

His youngest daughter is the apple of his eye.

他的小女儿是他的掌上明珠。

《新英汉大辞典》

They have no children, so their puppy is the apple of their eye.

这对夫妇没有子女，所以宠物小狗就是他们的掌上明珠。

youdao

She is extremely happy because this man is the apple of her eye, a very special person.

VOA: special.2009.09.06

Expressions from the King James Bible such as "the powers that be", "the apple of his eye", "signs of the times" and a "law unto themselves" are still part of the English language.

BBC: King James Bible: Queen marks 400th anniversary

In the blink of an eye, Apple will be beat in the markets where it counts.

FORBES: How BlackBerry Can Beat Apple And Return 400% To Investors

The apple of the option market's eye was Canadian wireless phone provider Research in Motion following surging earnings.

FORBES: Magazine Article